FIELD: technological processes, chemistry.
SUBSTANCE: invention is related to methods of polymerisation, which provide for control of composition distribution and viscosity of polymer melts. Methods are described for control of polyolefin melt viscosity, control of distribution of comonomer units of polyolefin, achievement of target viscosity of polyolefin melt and film made of such polyolefins. These methods include contact of olefin monomer and at least one comonomer with catalytic system in presence of fluid medium that is able to condense and includes saturated hydrocarbon, which contains from 2 to 8 carbon atoms. In one version catalytic system includes hafnium metallocene catalytic component.
EFFECT: possibility to control distribution of comonomer units by variation of condensable fluid medium concentration in polymerisation reactor.
13 cl, 7 tbl, 3 dwg, 13 ex
| Title | Year | Author | Number |
|---|---|---|---|
| FILMS WITH HIGH TEAR RESISTANCE, MADE OF POLYETHYLENES OBTAINED WITH HAFNOCENE CATALYST | 2004 |
|
RU2348659C2 |
| MIXED METALLOCENE CATALYTIC SYSTEMS CONTAINING A COMPONENT CAUSING POOR INSERTION OF COMONOMER AND A COMPONENT CAUSING GOOD INSERTION OF COMONOMER | 2002 |
|
RU2296135C2 |
| BIMODAL POLYETHYLENE | 2018 |
|
RU2791110C2 |
| HIGH-STRENGTH BIMODAL POLYETHYLENE COMPOSITIONS | 2005 |
|
RU2382800C2 |
| POLYMERS MADE WITH METALLOCENE CATALYSTS FOR USE IN ARTICLES MADE BY CENTRIFUGAL AND INJECTION MOULDING | 2007 |
|
RU2446180C2 |
| POLYETHYLENE COMPOSITIONS | 2009 |
|
RU2493182C2 |
| POLYMERIZATION PROCESS | 2001 |
|
RU2258712C2 |
| ETHYLENE AND ALPHA-OLEFIN COPOLYMERS AND POLYMERISATION METHODS FOR OBTAINING SAID COPOLYMERS | 2007 |
|
RU2434888C2 |
| INCREASED RATIO OF MELT INDEXES FOR POLYMER BY LOADING CATALYST ON SUBSTRATE SATURATED BY SELECTED LIQUID AGENT | 2013 |
|
RU2645216C2 |
| POLYOLEFINIC COPOLYMERIC COMPOSITION , METHOD OF POLYMERIZATION (VERSIONS), METALLOCENE CATALYST, FILM BASED ON COMPOSITION AND MIXTURE OF TWO OR MORE POLYMERIC COMPONENTS | 1997 |
|
RU2190632C2 |
